New line in legend does not work anymore in MATLAB 2017b

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Chris 2018-12-13

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https://ww2.mathworks.cn/matlabcentral/answers/435547-new-line-in-legend-does-not-work-anymore-in-matlab-2017b

编辑： dpb 2018-12-20

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Hi,

I want to make a multi line legend with MATLAB 2017b:

plot([1:100;1:5:500]');
legend({['test 1' char(10) 'done'],['test 2' char(10) 'done']});

This results in:

In previous versions of MATLAB this reulted in:

which is what I want.

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Chris 2018-12-14

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thanks for your reply. Her are the answers to your question:

1. Have you installed any patches to the base distribution?

- Not that I know of.

2. What is the OS?

- Windows 7 64 bit

3. Opengl info gives:

Version: '4.4.0'
Vendor: 'NVIDIA Corporation'
Renderer: 'Quadro K1100M/PCIe/SSE2'
RendererDriverVersion: '9.18.13.4075'
RendererDriverReleaseDate: '26-Aug-2014'
MaxTextureSize: 16384
Visual: 'Visual 0x07, (RGBA 32 bits (8 8 8 8), Z depth 16 bits, Hardware acceleration, Double buffer, Antialias 8 samples)'
Software: 'false'
HardwareSupportLevel: 'full'
SupportsGraphicsSmoothing: 1
SupportsDepthPeelTransparency: 1
SupportsAlignVertexCenters: 1
Extensions: {299×1 cell}
MaxFrameBufferSize: 16384

the opengl software is:

Version: '1.1.0'
Vendor: 'Microsoft Corporation'
Renderer: 'GDI Generic'
MaxTextureSize: 1024
Visual: 'Visual 0x17c, (RGB 24 bits (8 8 8), Z depth 16 bits, Software, Single buffer, Antialias 0 samples)'
Software: 'true'
HardwareSupportLevel: 'none'
SupportsGraphicsSmoothing: 0
SupportsDepthPeelTransparency: 0
SupportsAlignVertexCenters: 0
Extensions: {3×1 cell}
MaxFrameBufferSize: 0

4. Have you changed renderers or interpreters?

- I have changed the interpreter to latex but that did not have an effect. How do i change the rederer?

dpb 2018-12-14

编辑：dpb 2018-12-15

Figures... :(

Since this is system-dependent I think your only recourse will be to file a Bug Report through official TMW channels (via "Contact Us" link at top of each page) as they're the only ones who can now get into the internals of the legend function deeply enough to figure out what might be happening.

The only other thing I can think of trying would be to see if, after the legend is already created with a string that does work, whether you can modify the property of that element. This probably won't work, either, but it's one level deeper into the bowels than just passing the string at the top level.

I'm not sure without more "handle-diving" than I have time to undertake at the moment whether with the rewritten legend one even has access to that without resorting to further tricks of finding hidden objects.

In my opinion, TMW has done the user a real disservice in many of the changes they have made in this function that make it much more opaque than had been previously such that both debugging when there is a problem is near impossible plus special usages are more difficult than previously. Wish I had better news/ideas...

dpb 2018-12-18

OP could check that hypothesis fairly quickly...doesn't indicate whether has tried from a clean slate minimal test or not...I was presuming that would also fail on his system, but guess it's possible it wouldn't.

Then would be a treat to try to figure out which specific setting may have done the dirty...

Chris 2018-12-18

I reinstalled matlab which solved the problem....

Thanks everyone for their help!

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回答（1 个）

Yair Altman 2018-12-18

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/435547-new-line-in-legend-does-not-work-anymore-in-matlab-2017b#answer_352974

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The reason for the problem is that the default legend Interpreter ('lex') does not know how to interpret the '\n' in the label. \ prefixes are reserved in lex for special commands, but \n is not one of them (reference). Instead, you should use the char(10) or run your string through sprintf():

legend({'test 1\ndone', 'test 2\ndone'})  % not good
legend({sprintf('test 1\ndone'), sprintf('test 2\ndone')})  % good
legend({['test 1' 10 'done'], ['test 2' 10 'done']})  % also good

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Jan 2018-12-18

It works for me also under all Matlab releases I've tested: R6.5, R2009a, R2015a, R2016b. But for the OP it failed in 2017b and in another thread (link) R2017a was concerned. Re-installing 2017b solved (link) the problem for the OP. So I'm afraid we will not find the problem ever.

dpb 2018-12-19

编辑：dpb 2018-12-20

That the char(10) passed to legend was displayed in the error message as \n is, I think, most interesting...was there really a character substitution done in the passed-in string or is it just a fignewton of the error string handling formatting the byte to the string???

As in your tests, all expected-to-work perturbations worked here w/ R2014b, 16b, 17b, 18b

Since a re-install made OP's symptoms disappear, could possibly be related to a behind-the-scenes OS update...but you're right, we'll almost certainly never know for sure.

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